All morning, news sites, blogs, Twitter, and every other form of free communication have been buzzing with this claim that Natalie Portman didn’t really do all the dancing in her Oscar-winning role as Nina Sayers in Black Swan. The deal is that the woman who did all the “complicated” or “extremely difficult” scenes, Sarah Lane of New York’s American Ballet Theater Company, just released her claim that Portman only did “5 percent” of the dancing scenes in the film and furthered that by purporting to be a victim of a “cover-up.” Now, not…